brown spots on leaf underside

My Zee Zee plants do well but recently I’ve notice brown spots developing along the edge of a leaf. These spots are increasing in size and darken almost to a black color. I can not see any pests or mildew, etc. A spot develops on the underside of a leaf and a few days later there is a hole in the leaf.

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1 Comment To "brown spots on leaf underside"

#1 Comment By Downtoearthdigs On 07/19/2017 @ 9:57 pm

This could be due to overwatering; the biggest issue with ZZ plants.
This article will refresh you on the care requirements.

https://www.gardeningknowhow.com/houseplants/zz-plant/caring-for-zz-plant.htm ^[1]

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